Equipment Types, Hierarchy setup

Hi Ignatius,

We've used equipment on 2 large projects (3,500 & 15,000 equipment instances, 180,000 and 450,000 variable tags) so far and can highly recommend it.

In answer to your questions:

• I would recommend an ISA 95 style of hierarchy as this is useful for the operator to filter alarms etc and conveys an understanding of the structure of the plant.
• Yes you can add a tag to a piece of equipment.  It's not usually a great idea.
• You can populate any non-specified field manually in the relevant database table editor, however I would not recommend this generally.  Presumably you have an address based protocol.  This won't be the greatest experience, as sometimes we find it preferable to delete all of the variables/alarms/trends and regenerate from scratch.  You could make a utility of your own to merge the addresses [back] in I suppose.  We have used "tag name based" addressing which we are able to embed in the templates.  Perhaps you could arrange your PLC addressing so that you can supply a base address as a parameter to the equipment and build up the rest of it based on the item's offset or something.

A few other points:

• Getting the hierarchy correct is one of the most important and least well understood steps in this process.  You should engage your customer early.
• You will then need to decide whether to have your genies use the hierarchical name or the shorn name based on the tagprefix.  There are pro's and cons to both.  Wherever you need to get rolled up info from the alarm server, you will need the hierarchical name, however nobody refers to it by that name, so relating it back to a P&ID for example is a bit of a nightmare.
• The tag generator has some hidden functionality which can be used if you edit the XML directly.  This includes the ability to conditionally generate items based on a parameter.  This may address your second question.

Hope this helps

Stuart

Hi Ignatius,

We've used equipment on 2 large projects (3,500 & 15,000 equipment instances, 180,000 and 450,000 variable tags) so far and can highly recommend it.

In answer to your questions:

• I would recommend an ISA 95 style of hierarchy as this is useful for the operator to filter alarms etc and conveys an understanding of the structure of the plant.
• Yes you can add a tag to a piece of equipment.  It's not usually a great idea.
• You can populate any non-specified field manually in the relevant database table editor, however I would not recommend this generally.  Presumably you have an address based protocol.  This won't be the greatest experience, as sometimes we find it preferable to delete all of the variables/alarms/trends and regenerate from scratch.  You could make a utility of your own to merge the addresses [back] in I suppose.  We have used "tag name based" addressing which we are able to embed in the templates.  Perhaps you could arrange your PLC addressing so that you can supply a base address as a parameter to the equipment and build up the rest of it based on the item's offset or something.

A few other points:

• Getting the hierarchy correct is one of the most important and least well understood steps in this process.  You should engage your customer early.
• You will then need to decide whether to have your genies use the hierarchical name or the shorn name based on the tagprefix.  There are pro's and cons to both.  Wherever you need to get rolled up info from the alarm server, you will need the hierarchical name, however nobody refers to it by that name, so relating it back to a P&ID for example is a bit of a nightmare.
• The tag generator has some hidden functionality which can be used if you edit the XML directly.  This includes the ability to conditionally generate items based on a parameter.  This may address your second question.

Hope this helps

Stuart